William C. Chapman, MD
Colon & Rectal Surgery Physician · Saint Louis, MO
William C. Chapman, MD is a colon & rectal surgery physician with a practice address in Saint Louis, Missouri, and NPI 1003297177, issued on Jun 15, 2015. Check the license (Missouri 2017007784, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- William C. Chapman
- Credential
- MD
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License number
- 2017007784 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1044 N Mason RD, Saint Louis, MO 63141
- Phone
- (314) 454-7177
- Enumerated
- Jun 15, 2015
- Record last updated
- Apr 15, 2025
- Fax
- (888) 425-7946
- Medicaid ID
- 200044671 MO
- Medicare enrollment
- Enrolled (PECOS I20230606000999); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest colon & rectal surgery physician records → All 35 in Missouri → Look up another NPI →
Also registered at 1044 N Mason RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher Arett, MDUrology Physician1972600559
- Tara Aronberg, PAMedical Physician Assistant1952633976
- Lindsey Becker, PAPhysician Assistant1710648647
- Mary Beindorff, RDRegistered Dietitian1831720655
- Tyler Calkins, MDAdult Reconstructive Orthopaedic Surgery Physician1316501323
- Julie Coenen, NPAdult Health Nurse Practitioner1588122972
Verify William C. Chapman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2017007784Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% more Medicare Part D claims than the average colon & rectal surgery physician in 2024
251 Medicare Part D claims for 103 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D. 20 claims were for opioids.
Most prescribed
- Metronidazole59 claims
- Neomycin Sulfate58 claims
- Ondansetron Odt39 claims
- Sod Sulf-Potass Sulf-Mag Sulf30 claims
- Oxycodone Hcl15 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,094.20
2 payments; by number, the most common kind was food and beverage; the largest payer was Intuitive Surgical, Inc. The 1,524 providers of this specialty with any payment received $3,468.16 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Washington UniversitySaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William C. Chapman among 35 colon & rectal surgery physician records in Missouri
William C. Chapman, MD is one of 35 colon & rectal surgery physician records with a practice address in Missouri. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 83% of them.
- NPI issued2015 · 83% of these records are older, 11% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileYes · 86% of these records are
- Graduated2015 · median 2003 among the 30 with a school on file
- Record last updated2025 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208C00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Colon & Rectal Surgery Physician providers in Missouri
There are 35 colon & rectal surgery physician records in Missouri.
All 35 in Missouri → Every provider in Saint Louis → Colon & Rectal Surgery Physician nationwide →
The 8 colon & rectal surgery physician records with the nearest ZIP codes
- Steven Abbadessa, D.O.Saint Louis, MO 631411881668564
- Kathryn Galie, MDSaint Louis, MO 631411164433512
- Hannah-Ngoc Ha, M.D.Creve Coeur, MO 631411144223355
- Ira Kodner, MDSaint Louis, MO 631411760408983
- Eric Lederman, M.D.Saint Louis, MO 631411255368973
- Lawrence Mendelow, MDSaint Louis, MO 631411811932502
- Matthew Mutch, MDSaint Louis, MO 631411669498887
- Tatiana Ramirez Dominguez, MDSaint Louis, MO 631411043443377
Common questions
What is William C. Chapman, MD's NPI number?
William C. Chapman, MD's National Provider Identifier (NPI) is 1003297177, issued on Jun 15, 2015. An NPI identifies a provider in billing; it is not a license.
Where is William C. Chapman, MD located?
The NPPES record lists a practice address at 1044 N Mason RD, Saint Louis, MO, 63141. Phone: (314) 454-7177. Providers update this record themselves, so call before visiting.
How can I verify William C. Chapman, MD's license?
NPPES lists Missouri license number 2017007784, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William C. Chapman, MD prescribe under Medicare Part D?
In 2024, William C. Chapman, MD had 251 Medicare Part D claims for 103 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions only.
What is William C. Chapman, MD's MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.